Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 27, 2024
Abstract
Halide
anion
migration
in
organic–inorganic
metal
halide
perovskites
significantly
influences
the
power
conversion
efficiency
(PCE)
and
hysteresis
of
perovskite
solar
cells
(PSCs).
These
materials
are
sensitive
to
various
external
stimuli
such
as
light,
heat,
electrical
bias,
highlighting
need
for
novel
post‐manufacturing
treatment
methods
alongside
a
deeper
understanding
their
mechanisms.
Here,
dark
electro
(DE)
is
introduced
that
applies
negative‐positive‐negative
bias
PSC
under
conditions,
which
particularly
effective
formamidinium
(FA)
lead
iodide
(FAPbI
3
)
PSCs
processed
with
methylammonium
chloride
(MACl)
additive.
The
DE
treatment,
followed
by
light
soaking,
results
an
average
PCE
increase
2.9
±
1.8%
(from
initial
18.2
2.0%
21.1
0.8%
after
treatment)
notable
decrease
deviation.
It
discovered
residual
anions
from
MACl
play
critical
role
treatment.
shaking
electric
investigated
using
energy‐dispersive
X‐ray
spectroscopy
(EDX)
time‐of‐flight
secondary
ion
mass
(TOF‐SIMS).
This
study
elucidates
distribution
impact
anions,
providing
insights
into
mechanisms
underlying
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(17), С. 6256 - 6267
Опубликована: Янв. 1, 2024
Crystallization
kinetics
modulation
of
high-performance
flexible
perovskite
photovoltaics
achieving
autonomous
energy
generation
under
outdoor
settings.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(22), С. 8582 - 8592
Опубликована: Янв. 1, 2024
The
defect
density
on
the
top
surface
of
perovskite
thin
film
was
significantly
higher
than
that
in
bulk.
A
trimming
solvent
treatment
removed
defective
surface,
substantially
reducing
concentration
and
strain.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Окт. 21, 2024
Controlling
crystal
growth
alignment
in
low-dimensional
perovskites
(LDPs)
for
solar
cells
has
been
a
persistent
challenge,
especially
low-n
LDPs
(n
<
3,
n
is
the
number
of
octahedral
sheets)
with
wide
band
gaps
(>1.7
eV)
impeding
charge
flow.
Here
we
overcome
such
transport
limits
by
inducing
vertical
through
addition
chlorine
to
precursor
solution.
In
contrast
3D
halide
(APbX3),
find
that
Cl
substitutes
I
equatorial
position
unit
cell,
strain
perovskite
octahedra,
and
critical
initiating
growth.
Atomistic
modelling
demonstrates
thermodynamic
stability
miscibility
Cl/I
structures
indicating
preferential
arrangement
Cl-incorporation
at
I-sites.
Vertical
persists
cell
level,
giving
rise
record
9.4%
power
conversion
efficiency
1.4
V
open
circuit
voltage,
highest
reported
2
eV
gap
device.
This
study
an
atomic-level
understanding
tunability
unlocks
new
device
possibilities
smart
facades
indoor
energy
generation.
bandgap
challenge.
Here,
authors
induce
solution,
devices.
Perovskite
solar
cells
(PSCs)
are
undergoing
rapid
development
and
exhibit
considerable
potential
for
commercialization.
Recent
studies
have
shown
that
reverse
bias
can
improve
the
open‐circuit
voltage
(
V
OC
)
of
PSCs
by
≈0.06
due
to
migration
iodine
ions
filling
vacancies
at
electron
transport
layer
(ETL)/perovskite
interface.
It
be
deduced
in
iodine‐rich
PSCs,
reverse‐biasing
enhance
is
limited
suppression
excess
atoms.
This
work
confirms
that,
has
a
minimal
effect
on
,
but
leads
≈3.9%
increase
short‐circuit
current
density
J
SC
),
from
25.40
26.40
mA/cm
2
an
enhancement
≈3.2%
power
conversion
efficiency
23.00%
23.74%.
The
improved
attributed
reduced
carrier
recombination
near
ETL/perovskite
interface,
as
evidenced
enhanced
external
quantum
increased
resistance
short‐wavelength
region.
These
insights
suggest
practical
posttreatment
strategy
high‐performance
PSCs.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 29, 2025
Formamidinium-based
perovskites
(FA
perovskites)
often
incorporate
methylammonium
chloride
(MACl)
to
stabilize
the
α-FAPbI3
phase
and
prevent
formation
of
δ
phase.
However,
MACl
undergoes
deprotonation
reacts
with
FA,
leading
generation
unstable
byproducts
that
can
cause
component
degradation
negatively
impact
device
performance.
In
this
study,
we
introduce
ethylenediaminetetramethylenephosphonic
acid
as
a
corrosion
inhibitor,
which
effectively
prevents
these
stabilizes
α-FAPbI3.
The
resulting
perovskite
solar
module
achieved
power
conversion
efficiency
22.44%.
Furthermore,
maintained
approximately
83%
its
initial
after
2136
h
damp-heat
testing
(85
°C
85%
RH),
while
maximum
point
tracking
retained
88.7%
1000
h.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 27, 2025
Methylammonium
chloride
(MACl)
additive
is
almost
irreplaceable
in
high-performance
formamidinium
(FA)
perovskite
photovoltaics.
However,
the
byproduct
of
methyl
(MFA+)
from
reaction
MA0
and
FA
damages
compositional
purity
phase
stability
α-FAPbI3.
The
addition
iodine
(I2)
to
FAPbI3
precursor
has
been
reported
inhibit
formation
MFA+.
Here,
we
systematically
investigate
effect
MAI
on
films
devices
by
using
replace
MACl
I2.
results
demonstrate
that
produces
more
I3-
precursor,
which
inhibits
between
MA
thus
blocks
Meanwhile,
MFA+
reduced
due
delayed
evaporation
caused
its
strong
interaction
with
I3-,
facilitating
growth
α-FAPbI3
an
improved
bottom
morphology.
It
eliminates
unreacted
PbI2,
forming
a
homogenized
phase,
facilitates
ordered
along
(111)
facet,
enhancing
charge
transport
increasing
open-circuit
voltage
(VOC).
optimized
device
shows
2%
improvement
PCE,
VOC
1.050
1.103
V.
Additionally,
target
retains
97%
initial
performance
after
5495
min
operation
under
maximum
power
point
tracking,
compared
82.3%
2000
for
control
device.
This
work
provides
insights
into
inhibiting
byproducts
induced
MA-FA
side
following
introduction
MACl.
The
halide
perovskite
formamidinium
lead
iodide
(FAPbI3)
is
a
prime
candidate
for
photovoltaics
due
to
its
excellent
optoelectronic
properties,
but
application
has
been
limited
structural
instability.
large
size
of
the
FA
cation
results
in
metastability
photoactive
cubic
phase
and
facile
degradation
into
thermodynamically
stable
hexagonal
phases
at
room
temperature.
Recently,
incorporation
two-dimensional
(2D)
Ruddlesden–Popper
seeds
FAPbI3
precursor
solution
was
shown
template
growth
stabilize
FAPbI3.
Here,
we
investigate
nanoscale
mechanisms
behind
observed
bulk
stabilization
using
synchrotron-based
X-ray
microscopies.
Nanoprobe
diffraction
reveals
2D-templated
films
exhibit
an
average
compressive
strain
normal
substrate
−3.3%,
2-fold
larger
than
that
MACl-stabilized
This
compression
creates
locally
templated
regions
composed
tetragonal-phase
distributed
nonuniformly
throughout
film
with
fewer
crystalline
defects
purely
regions.
Scanning
excited
optical
luminescence
(X-ray
analog
photoluminescence)
this
local
templating
increased
radiative
recombination
red-shifted
band
edge
emission.
Our
provide
insight
microscopic
mechanism
2D
perovskites
as
templates.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 7, 2025
Abstract
In
perovskite‐organic
tandem
solar
cells,
the
wide‐bandgap
perovskite
front
subcells
with
high
bromide
concentrations
suffer
from
increased
defect
state
density,
which
adversely
affects
efficiency
and
stability
of
devices.
this
work,
a
difunctional
polymerizable
additive,
N‐(3‐(dimethylamino)propyl)‐methacrylamide
(DPM),
is
introduced
into
1.86
eV
film,
where
it
undergoes
in
situ
thermal
polymerization
to
form
polymeric
network.
Primarily,
polymer
contains
multiple
functional
groups
that
interact
A‐site
cations
adjacent
chains,
creating
dynamic
hydrogen
bond
This
network
effectively
passivates
grain
boundary
defects,
inhibits
ion
migration,
consequently
reduces
non‐radiative
recombination.
addition,
storage
mixed
FA
+
/MA
precursor
solution
enhanced,
as
condensation
reaction
between
MA
efficiently
suppressed
by
DPM.
As
result,
study
achieves
power
conversion
(PCE)
18.19%
cells.
The
device
retains
84%
its
initial
after
operating
at
maximum
point
for
1000
h.
Most
notably,
PCE
25.06%
achieved
integrating
subcell
monolithic
cell.
